20204312331 has 16 divisors (see below), whose sum is σ = 31177241600. Its totient is φ = 11399177088.

The previous prime is 20204312311. The next prime is 20204312353. The reversal of 20204312331 is 13321340202.

It is not a de Polignac number, because 20204312331 - 2⁵ = 20204312299 is a prime.

It is a super-2 number, since 2×20204312331² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20204312298 and 20204312307.

It is not an unprimeable number, because it can be changed into a prime (20204312311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6087646 + ... + 6090963.

It is an arithmetic number, because the mean of its divisors is an integer number (1948577600).

Almost surely, 2^20204312331 is an apocalyptic number.

20204312331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20204312331 is a deficient number, since it is larger than the sum of its proper divisors (10972929269).

20204312331 is a wasteful number, since it uses less digits than its factorization.

20204312331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12178698.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20204312331 its reverse (13321340202), we get a palindrome (33525652533).

The spelling of 20204312331 in words is "twenty billion, two hundred four million, three hundred twelve thousand, three hundred thirty-one".